Fix Ruby 2.7 deprecation warnings for ci/pipeline/chain

In Ruby 3.0, positional arguments and keyword arguments will be
separated. Ruby 2.7 will warn for behaviors that will change in Ruby
3.0. In most cases, you can avoid the incompatibility by adding the
double splat operator. It explicitly specifies passing keyword arguments
instead of a Hash object.

app/validators/addressable_url_validator.rb

@@ -80,7 +80,7 @@ class AddressableUrlValidator < ActiveModel::EachValidator
 
     value = strip_value!(record, attribute, value)
 
-    Gitlab::UrlBlocker.validate!(value, blocker_args)
+    Gitlab::UrlBlocker.validate!(value, **blocker_args)
   rescue Gitlab::UrlBlocker::BlockedUrlError => e
     record.errors.add(attribute, options.fetch(:blocked_message) % { exception_message: e.message })
   end

lib/gitlab/ci/pipeline/chain/command.rb

@@ -16,7 +16,7 @@ module Gitlab
         ) do
           include Gitlab::Utils::StrongMemoize
 
-          def initialize(**params)
+          def initialize(params = {})
             params.each do |key, value|
               self[key] = value
             end

lib/gitlab/ci/variables/collection/item.rb

@@ -36,9 +36,9 @@ module Gitlab
           def self.fabricate(resource)
             case resource
             when Hash
-              self.new(resource.symbolize_keys)
+              self.new(**resource.symbolize_keys)
             when ::Ci::HasVariable
-              self.new(resource.to_runner_variable)
+              self.new(**resource.to_runner_variable)
             when self
               resource.dup
             else

lib/gitlab/config/entry/factory.rb

@@ -79,7 +79,7 @@ module Gitlab
         end
 
         def fabricate(entry_class, value = nil)
-          entry_class.new(value, @metadata) do |node|
+          entry_class.new(value, **@metadata) do |node|
             node.key = @attributes[:key]
             node.parent = @attributes[:parent]
             node.default = @attributes[:default]

lib/gitlab/config/entry/simplifiable.rb

@@ -19,7 +19,7 @@ module Gitlab
 
           entry = self.class.entry_class(strategy)
 
-          @subject = entry.new(config, metadata, &blk)
+          @subject = entry.new(config, **metadata, &blk)
 
           super(@subject)
         end